wtorek, 17 października 2017
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! EN_90242567_0001 SCI
PHOTO: EAST NEWS/SCIENCE PHOTO LIBRARY Artwork featuring different types of white blood cells that comprise the orchestra of the human immune system, the body's defence mechanism. The maturation of cells derived from bone marrow is featured at bottom left. There are three main types of white cells - lymphocytes, leucocytes and monocytes (the large macrophage at top right is a monocyte). Lymphocytes originate in the bone marrow & mature there or in the thymus - hence the names B-lymphocytes (blue, centre right) and T- lymphocytes (orange, bottom). B-cells produce antibodies, chemicals that disable invading microorganisms. Some T-cells attack other cells infected with viruses directly.
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! EN_90229624_0001 SCI
PHOTO: EAST NEWS/SCIENCE PHOTO LIBRARY Illustration based on a scanning electron micrograph of a human macrophage phagocytosing (engulfing) a latex bead. Macrophages are monocytes from circulating blood that have migrated to tissues, notably in lymphatic system & lungs; certain types migrate to sites of infection in response to chemical stimuli. In addition to a scavenging role, the macrophage is capable of processing antigenic (foreign) substances during initial phase of immune response. Processed antigens are presented on the macrophage's surface so they might be recognized and possibly ultimately eliminated by specific lymphocytes.
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